New 21.5-inch Retina 4K models expected.
Adobe Releases Flash Player Update to Patch Security Holes as Apple Blocks Earlier Versions
Adobe is also aware of reports that CVE-2013-0634 is being exploited in the wild in attacks delivered via malicious Flash (SWF) content hosted on websites that target Flash Player in Firefox or Safari on the Macintosh platform, as well as attacks designed to trick Windows users into opening a Microsoft Word document delivered as an email attachment which contains malicious Flash (SWF) content.Users can manually download the new 11.5.502.149 version of Flash Player from Adobe's site, or those who have specified that Adobe may update Flash Player automatically may simply allow it to do so.
In response to the issue, Apple has updated its Xprotect anti-malware system to enforce new minimum version requirements blocking all previous versions of Flash Player. Apple has used the system several times over the past month to block vulnerable versions of Java.
Apple has also posted a new support document addressing the issue and explaining to users how to update Flash Player when they discover that the plug-in has been blocked.